package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName="loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login",//移动端登录

        };
//        2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
//        3.若不需要处理则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
//        4.1判断登录状态，若已登录则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId=(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrenId(empId);

            long id=Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
//        4.2判断登录状态，若已登录则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("user"));

            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrenId(userId);

            long id=Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
//        5.若未登录则返回未登录结果,通过输出流方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


        /**
         *
         * @param urls
         * @param requestURI
         * @return
         */
        public boolean check (String[]urls, String requestURI){
            for (String url : urls) {
                boolean match=PATH_MATCHER.match(url, requestURI);
                if(match) {
                    return true;
                }
            }
            return false;
        }
    }
